Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bb8dd183551367…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 08:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73ee48068e7f86668e947fa5facf96c2 SHA-1: 332c82a91f5e8b773d38971535497707752ce0c0 SHA-256: b3bb8dd183551367bf866880282329c0b0a047700fd23ec7b34a258893592539
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through the linked PDFs. The document body is unreadable, but the heuristics and URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ambulanceservice.pl/userfiles/file/vaxugadokaj.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/forowatogi.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/mediwatigakedax.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/32769334752.pdfIn PDF document text
    • http://minipit.com/data/files/42418173673.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/vaxenugajelupirukurini.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/26115080999.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b7160b63---vozem.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/32050439033.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/rikivarutenabenukafixipom.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/nomitexuduvigo.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/41536580284.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/50494369646.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/081f1dc88d7a6abb07885ebeaa1b5249/78410790286.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/magulowuwalovovakedafudob.pdfIn PDF document text
    • http://falerisztika.hu/tmp/84528240398.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/39062518496.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/58959592499.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/miviwube.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021937231792.pdfIn PDF document text
    • https://icbacademy.com/upload/files/kovedavimakonegibez.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/8658224495.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/99557321967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=house+design+plans+3d+4+bedroomsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 11116 bytes
SHA-256: 43407873627fad5dae98f46000da33307fe74440a373eb68db4559ef61ec3106
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027F 17928 bytes
SHA-256: 107c23ef31aef424706048009d25a599eb1793d741a4bb27129b06421ac87a97